Sideboard



FIG. 1 is a front perspective view of a sideboard and showing my design;

FIG. 2 is a front perspective view with the front panel partially open;

FIG. 3 is a front view thereof;

FIG. 4 is a rear view thereof;

FIG. 5 is a right side view thereof;

FIG. 6 is a top view thereof; and,

FIG. 7 is a bottom view thereof. 

The ornamental design for a sideboard, as shown and described. 